research, without attaching undue importance to certain gleams of light which the regular appearance of the mysterious letters has shed upon the case, all that I possess is Gaston Sauverand's story. Must I not make use of it?"
And, once again, as when one follows a path by another person's tracks, be began to live through the adventure which Sauverand had been through. He compared it with the picture of it which he had imagined until then. The two were in opposition; but could not the very clash of their opposition be made to produce a spark of light?
"Here is what he said," he thought, "and there is what I believed. What does the difference mean? Here is the thing that was, and there is the thing that appeared to be. Why did the criminal wish the thing that was to appear under that particular aspect? To remove all suspicion from him? But, in that case, was it necessary that suspicion should fall precisely on those on whom it did?"
The questions came crowding one upon the other. He sometimes answered them at random, mentioning names and uttering words in succession, as though the name mentioned might be just that of the criminal, and the words uttered those which contained the unseen reality.
Then at once he would take up the story again, as schoolboys do when parsing and analyzing a passage, in which each expression is carefully sifted, each period discussed, each sentence reduced to its essential value.
Hours and hours passed. Suddenly, in the middle of the night, he gave a start. He took out his watch, By
